A rippled dune near Herschel crater undulates in the thin Martian wind.
The dark sand of this barchan dune changes position between June 15, 2008 and May 21, 2010.
"The benefit of long-term observations from orbit became evident today with the release of images from NASA’s Mars Reconnaissance Orbiter showing the subtly shifting motion of large sand dunes on the red planet, proving that the surface of Mars is much more dynamic than previously believed !"
via universetoday.com
